#coverdrop
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lambda.bsky.social
We launched CoverDrop 🎉 providing sources with a secure and anonymous way to talk to journalists. Having started five years ago as a PhD research project, this now ships within the Guardian app to millions of users—all of which provide cover traffic. Paper, code, and more info: www.coverdrop.org
CoverDrop: Blowing the Whistle Through A News App
www.coverdrop.org
June 9, 2025 at 1:00 PM
matthewdgreen.bsky.social
My student pointed me to this paragraph in the Guardian’s “CoverDrop” white paper. Gagh we need more good software engineers to build libraries!
October 1, 2025 at 6:16 PM
itsibitzi.dev
My team launched this today! A new tip-off platform based on research from the University of Cambridge. It's been a great collaboration :)

For more technical details on the underlying protocol (CoverDrop) check out coverdrop.org
June 9, 2025 at 11:40 AM
lambda.bsky.social
One of my favourite CoverDrop details: out-of-band verification of the trusted organization key which signs the entire key hierarchy. Its digest is included in the imprint of every printed Guardian newspaper, removing the need to trust CAs 🔑🗞️ more details: www.coverdrop.org
The picture shows a smartphone and the imprint of a newspaper. The smartphone displays a screen from the SecureMessaging feature showing a key digest. The newspaper imprint shows the same digest. The digest consists of a number of randomly-looking letters and digits.
July 29, 2025 at 10:45 AM
potculturemagazine.com
#FirstToke The June cover just landed. Sun’s high, smoke’s thicker, and summer just found its spark. wp.me/pflf86-2cO
#PotCultureMagazine #CannabisCulture #420Community #WeedLife #June #CoverDrop #HighSummer #BluntForceStyle #Blaze #Cannabis #Weed #CannabisCommunity #Weed
June 5, 2025 at 3:00 PM
cst.cam.ac.uk
'From research lab to newsroom: deploying secure whistleblower technology'.
@arberesford.bsky.social & @lambda.bsky.social
discuss their secure comms technology CoverDrop which now helps whistleblowers contact @theguardian.com journalists safely.
🗓️ Weds 12 Nov
🕒 15:05 (GMT)
👉🏼 shorturl.at/FbMWc
The Guardian's Secure Messaging Service helps whistleblowers contact journalists without fear of their messages being discovered and read by others. It builds on the 'CoverDrop' secure messaging technology that was developed by researchers here, as Prof Alastair Beresford and Dr Daniel Hugenroth will discuss in their talk on Wednesday 12 November 2026.
November 11, 2025 at 2:23 PM
hoy.la
The Guardian's Secure Messaging tool is an implementation of the CoverDrop protocol, which was invented by researchers at www.cst.cam.ac.uk

We have published our code under an Apache 2.0 licence at github.com/guardian/cov...

There's a technical paper on how it works at www.coverdrop.org
CoverDrop: Blowing the Whistle Through A News App
www.coverdrop.org
June 9, 2025 at 7:01 AM
stuartd.dev
All true of course, but the facts this is a) open source and b) written in Rust are good indications - github.com/guardian/cov...
GitHub - guardian/coverdrop: Blowing the whistle through a news app
Blowing the whistle through a news app. Contribute to guardian/coverdrop development by creating an account on GitHub.
github.com
June 9, 2025 at 10:56 PM
darlenefredette.bsky.social
Secret Recipe - A Redford Falls Story, book 4 - coming soon! #SecretRecipe #RedfordFallsSeries #ContemporaryRomance #smalltownromance #CoverReveal #BookCoverReveal #ComingSoon #CoverDrop #BookCommunity #RomanceBooks #RomanceReaders
January 6, 2026 at 3:41 PM
harshak.bsky.social
CoverDrop: a secure messaging system for newsreader apps github.com/guardian/cov... from guardian @robinnf.bsky.social @sudhira.bsky.social
GitHub - guardian/coverdrop: Blowing the whistle through a news app
Blowing the whistle through a news app. Contribute to guardian/coverdrop development by creating an account on GitHub.
github.com
June 9, 2025 at 8:57 PM
katebevan.com
Had a quick read of the GitHub page. Seems like a clever idea, but as others have pointed out, a) you're installing an app to use it which tracks you to buggery and b) Signal and Securedrop already exist github.com/guardian/cov...
GitHub - guardian/coverdrop: Blowing the whistle through a news app
Blowing the whistle through a news app. Contribute to guardian/coverdrop development by creating an account on GitHub.
github.com
June 9, 2025 at 7:16 AM
coralmagazine.bsky.social
#CORALmagazine #COVERdrop #sneakpeek —Due to some staff schedules, you must subscribe by August 6th to receive our September/October issue as your first issue! www.coralmagazine.com/subscribe
#bolusmethod #cyclingareeftank #breedingstonefish #reeftanks #reefaquariums #coral #aquariummagazine
July 21, 2025 at 10:51 PM
lambda.bsky.social
Yes, the full CoverDrop system is open-source, we had an OTF-sponsored audit, and we have shared the design early with other researchers for feedback. github.com/guardian/cov...
GitHub - guardian/coverdrop: Blowing the whistle through a news app
Blowing the whistle through a news app. Contribute to guardian/coverdrop development by creating an account on GitHub.
github.com
June 9, 2025 at 3:03 PM
dcprose.bsky.social
ARC and cover drop. Invisibilia, coming from Slant Books in April. Coffee is extra.

#booksky
#writingcommunity #coverdrop
#shortstories
Book cover for Invisibilia, short story collection. Cover shows an invisible guy in a blazer with his hat falling off. Also a nice looking mug of coffee. All in all, looks like something you’ll want to read.
January 16, 2026 at 3:31 PM
lambda.bsky.social
Our CoverDrop white paper has a lot more technical details and we are immensely grateful to everyone who have provided us with valuable feedback throughout this project: www.cl.cam.ac.uk/techreports/...
www.cl.cam.ac.uk
June 9, 2025 at 1:02 PM
lambda.bsky.social
CoverDrop involved users from the very beginning—avoiding the “solution looking for problem” trap. Big shout out to @mansoor.bsky.social , Diana, and @arberesford.bsky.social for getting this right from the very beginning by running two very insightful workshops with journalists and engineers.
June 27, 2025 at 1:58 PM
anil.recoil.org
Brilliant visual style in the explanation of CoverDrop (the new Guardian secure messaging protocol) in their technical report. I really like how it segments technical elements via keywords for the reader; nice work @lambda.bsky.social @arberesford.bsky.social et al! www.coverdrop.org/coverdrop_gu...
www.coverdrop.org
June 9, 2025 at 12:41 PM
charan-neuro.bsky.social
#CoverDrop!!! for my book WHY WE REMEMBER , now available for pre-order from
@doubledaybooks
due out February 2024! https://penguinrandomhouse.com/books/705542/why-we-remember-by-charan-ranganath-phd/
Cover image for #WhyWeRemember with a brain-shaped cloud. The back of the cloud is blowing away, much like many of our memories do.
August 18, 2023 at 4:41 PM
hnbot.gsuscs.xyz
CoverDrop: A secure messaging system for newsreader apps

https://github.com/guardian/coverdrop
June 9, 2025 at 4:00 PM
potculturemagazine.com
#WakeNBake Good morning, Connoisseurs! Coming up at 10 AM (CST), the summer issue hits. The joint’s lit, the rules are off, and the floaties are optional.
#PotCultureMagazine #CannabisCulture #420Community #WeedLife #CoverDrop #June #Hot #Blaze #Cannabis #Weed #CannabisCommunity
June 5, 2025 at 1:00 PM
markmx.bsky.social
Thanks, I just saw Daniel Hugenroth present his work on CoverDrop at RWC!
March 12, 2026 at 1:45 PM
cst.cam.ac.uk
Delighted to see this technology - which builds on our 'CoverDrop' security research - being implemented by @theguardian.com
shorturl.at/Et0Rf
Guardian launches messaging tech for whistleblowers developed with researchers here | Department of Computer Science and Technology
Media organisation The Guardian is today launching Secure Messaging, a confidential way for whistleblowers to contact journalists that builds on technology developed here.
shorturl.at
June 9, 2025 at 12:30 PM
alexparsons.bsky.social
Writing something towards the more technical side of "pro democracy tech" and this explanation of the Guardian's CoverDrop system/use of Rust is interesting www.youtube.com/watch?v=8n13...
S. Cutler, D. Hugenroth, Z. Hunter Green: "Secure Messaging: The Guardian’s Whistleblowing System"
YouTube video by Rust Foundation
www.youtube.com
December 17, 2025 at 10:50 AM
devgard.bsky.social
This is a really cool way to anonymously tip, www.coverdrop.org explains why you'd use this over something like Signal or Tor, which I was curious about!

#CyberSec
June 9, 2025 at 2:17 PM